https://whatsyum.com
Got rejected by YC '24 but wanted to build it anyway
Just started fundraising for seed round
Ask HN: What are you working on? (September 2025)
471–480 of 1001 posts
Re: Ask HN: What are you working on? (September 2025)
#472On the side, I‘m building a platform that allows to run MCP servers on demand, making them reachable under a public URL, but password-protected.
You also get an embedded VNC viewer, and thus you can watch what an AI-agent is doing with it.
This makes it possible to use your own, dedicated MCP server instances from, for example, n8n workflows, without thinking about infrastructure.
Re: Ask HN: What are you working on? (September 2025)
#473I’ve created an AI-powered app designed to help candidates prepare for Meta’s product manager interviews, with a focus on product execution questions. The app allows you to practice by speaking or typing your responses, then uses AI to score answers against a rubric and track your progress over time. I’m looking for beta testers—happy to share early access if you’re interested! If you are please message me.
Would this tool be useful for internships too? I work with students who are looking to interview for internship roles in PM
Re: Ask HN: What are you working on? (September 2025)
#474I'm working on Happy Coder, an open source Codex and Claude Code native mobile app (plus a web app).
Happy lets you spawn and control multiple Codex/Claude Code sessions in parallel. Happy Coder runs on your hardware, works from your phone and desktop, costs nothing, End to End encrypted, and permissive MIT License.
https://github.com/slopus/happy
Happy Coder is a unix style "do one thing well" project.
The goal is zero workflow disruption. I want to be able to run CLI coding agents on any internet connected computer, and control them with my phone. Happy has a command line wrapper for Codex and Claude Code that let you start a session in your terminal, and then continue it from your phone with real time sync. So type in your terminal and see it on the phone, type into your phone and see it in your terminal. So you can switch back and forth.
There is an optional voice agent some contributors have been hacking on that lets you talk to the voice agent first, and the voice agent then writes prompts for Codex/Claude Code and answers questions about what the coding agent running on your computer is doing/did. The voice agent feature is pretty neat, but in my opinion needs a bit more iteration, so any ideas or help would be awesome.
Re: Ask HN: What are you working on? (September 2025)
#475I'm working on Pruno (https://pruno.dev/), it's similar to Dependabot/Renovate bot but it removes dependencies instead.
My team suffers from dependency creep. As soon as your system grows, the number of dependencies skyrockets. In Python/Javascript projects it's especially hard to determine which dependencies are not used anymore.
Pruno saves time for your team by automating this work. It's still WIP, but I'd like to get feedback. How are you dealing with your dependencies?
Re: Ask HN: What are you working on? (September 2025)
#476I'm trying to make an RF lightning detector small enough to trivially add to my motorbike.
I live in Viet Nam, and driving through bad storms this time of year is pretty miserable, and they happen fast and are local enough that weather prediction is not terribly useful.
There are a lot of problems with EMI. Lots of ungrounded brushed motors everywhere that make the RF bits hard. If I succeed, I'll publish the PCB designs.
I've also got some educational products in production right now, about Vietnamese history. I'd share a link, but my website probably can't handle the traffic right now.
Re: Ask HN: What are you working on? (September 2025)
#477I launched Quiet UI this week: https://quietui.org/ It prioritizes accessibility, longevity, performance, and simplicity. With the autoloader, one script tag loads components dynamically without downloading the entire library. (npm also available.) Theming uses color-mix() and OKLAB to create uniform color palettes from a single CSS property. Adaptive palettes are used for dark mode. All form controls are form-associ…
Your docs are great! How did you create them? Did you use external tools to generate them?
Re: Ask HN: What are you working on? (September 2025)
#478"Google maps but for old maps": https://pastmaps.com This is a solo startup that I've been working on for 2 years now. It's a labor of love and I'm very lucky and thankful that it's big enough to surprisingly pay all of our bills. Still constantly feeling FOMO over all of my startup buddies working with AI and LLMs while I plug away at old maps and GIS . It gets ~80K MAUs and just slowly and consistently is growing o…
I would love to use this if it supported Italy
Re: Ask HN: What are you working on? (September 2025)
#479Currently working on Autonoly, you can automate anything that can be done digitally.
Re: Ask HN: What are you working on? (September 2025)
#480I've been building https://resolver.one - a DNS server that returns GeoIP data as TXT records. Query an IP directly as the hostname (e.g. dig TXT 8.8.8.8.rslvr.one) and get back country, ASN, etc. Always been fascinated by repurposing established protocols for unintended uses - DNS is everywhere, passes through firewalls, and has built-in caching. Seemed like a fun way to deliver location data without HTTP APIs. Supe…
Neat idea, even if it doesn't end up going anywhere. Out of curiosity, are you able to share what your source of data is? Isn't GeoIP data typically licensed?
Data source is IPinfo Lite MMDB file, which seems to be offered freely without restrictions. I'd love to offer comprehensive GeoIP attributes but I'm afraid to even ask how much the DB download of that costs... I'm working on supporting new data sets now like security CVEs, shodan integration, etc.